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Title: SCALA: In situ calibration for integral field spectrographs

Abstract

The scientific yield of current and future optical surveys is increasingly limited by systematic uncertainties in the flux calibration. This is the case for type Ia supernova (SN Ia) cosmology programs, where an improved calibration directly translates into improved cosmological constraints. Current methodology rests on models of stars. Here we aim to obtain flux calibration that is traceable to state-of-the-art detector-based calibration. Methods. We present the SNIFS Calibration Apparatus (SCALA), a color (relative) flux calibration system developed for the SuperNova integral field spectrograph (SNIFS), operating at the University of Hawaii 2.2 m (UH 88) telescope. Results. By comparing the color trend of the illumination generated by SCALA during two commissioning runs, and to previous laboratory measurements, we show that we can determine the light emitted by SCALA with a long-term repeatability better than 1%. We describe the calibration procedure necessary to control for system aging. We present measurements of the SNIFS throughput as estimated by SCALA observations. Conclusions. The SCALA calibration unit is now fully deployed at the UH 88 telescope, and with it color-calibration between 4000 Å and 9000 Å is stable at the percent level over a one-year baseline.

Authors:
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Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Gordon & Betty Moore Foundation (GBMF); German Science Foundation
Contributing Org.:
The Nearby Supernova Factory
OSTI Identifier:
1532268
Grant/Contract Number:  
AC02-05CH11231; 11173017
Resource Type:
Accepted Manuscript
Journal Name:
Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 607; Journal ID: ISSN 0004-6361
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; telescopes; instrumentation: miscellaneous; standards; methods: data analysis

Citation Formats

Lombardo, S., Küsters, D., Kowalski, M., Aldering, G., Antilogus, P., Bailey, S., Baltay, C., Barbary, K., Baugh, D., Bongard, S., Boone, K., Buton, C., Chen, J., Chotard, N., Copin, Y., Dixon, S., Fagrelius, P., Feindt, U., Fouchez, D., Gangler, E., Hayden, B., Hillebrandt, W., Hoffmann, A., Kim, A. G., Leget, P. -F., McKay, L., Nordin, J., Pain, R., Pécontal, E., Pereira, R., Perlmutter, S., Rabinowitz, D., Reif, K., Rigault, M., Rubin, D., Runge, K., Saunders, C., Smadja, G., Suzuki, N., Taubenberger, S., Tao, C., and Thomas, R. C. SCALA: In situ calibration for integral field spectrographs. United States: N. p., 2017. Web. doi:10.1051/0004-6361/201731076.
Lombardo, S., Küsters, D., Kowalski, M., Aldering, G., Antilogus, P., Bailey, S., Baltay, C., Barbary, K., Baugh, D., Bongard, S., Boone, K., Buton, C., Chen, J., Chotard, N., Copin, Y., Dixon, S., Fagrelius, P., Feindt, U., Fouchez, D., Gangler, E., Hayden, B., Hillebrandt, W., Hoffmann, A., Kim, A. G., Leget, P. -F., McKay, L., Nordin, J., Pain, R., Pécontal, E., Pereira, R., Perlmutter, S., Rabinowitz, D., Reif, K., Rigault, M., Rubin, D., Runge, K., Saunders, C., Smadja, G., Suzuki, N., Taubenberger, S., Tao, C., & Thomas, R. C. SCALA: In situ calibration for integral field spectrographs. United States. doi:10.1051/0004-6361/201731076.
Lombardo, S., Küsters, D., Kowalski, M., Aldering, G., Antilogus, P., Bailey, S., Baltay, C., Barbary, K., Baugh, D., Bongard, S., Boone, K., Buton, C., Chen, J., Chotard, N., Copin, Y., Dixon, S., Fagrelius, P., Feindt, U., Fouchez, D., Gangler, E., Hayden, B., Hillebrandt, W., Hoffmann, A., Kim, A. G., Leget, P. -F., McKay, L., Nordin, J., Pain, R., Pécontal, E., Pereira, R., Perlmutter, S., Rabinowitz, D., Reif, K., Rigault, M., Rubin, D., Runge, K., Saunders, C., Smadja, G., Suzuki, N., Taubenberger, S., Tao, C., and Thomas, R. C. Wed . "SCALA: In situ calibration for integral field spectrographs". United States. doi:10.1051/0004-6361/201731076. https://www.osti.gov/servlets/purl/1532268.
@article{osti_1532268,
title = {SCALA: In situ calibration for integral field spectrographs},
author = {Lombardo, S. and Küsters, D. and Kowalski, M. and Aldering, G. and Antilogus, P. and Bailey, S. and Baltay, C. and Barbary, K. and Baugh, D. and Bongard, S. and Boone, K. and Buton, C. and Chen, J. and Chotard, N. and Copin, Y. and Dixon, S. and Fagrelius, P. and Feindt, U. and Fouchez, D. and Gangler, E. and Hayden, B. and Hillebrandt, W. and Hoffmann, A. and Kim, A. G. and Leget, P. -F. and McKay, L. and Nordin, J. and Pain, R. and Pécontal, E. and Pereira, R. and Perlmutter, S. and Rabinowitz, D. and Reif, K. and Rigault, M. and Rubin, D. and Runge, K. and Saunders, C. and Smadja, G. and Suzuki, N. and Taubenberger, S. and Tao, C. and Thomas, R. C.},
abstractNote = {The scientific yield of current and future optical surveys is increasingly limited by systematic uncertainties in the flux calibration. This is the case for type Ia supernova (SN Ia) cosmology programs, where an improved calibration directly translates into improved cosmological constraints. Current methodology rests on models of stars. Here we aim to obtain flux calibration that is traceable to state-of-the-art detector-based calibration. Methods. We present the SNIFS Calibration Apparatus (SCALA), a color (relative) flux calibration system developed for the SuperNova integral field spectrograph (SNIFS), operating at the University of Hawaii 2.2 m (UH 88) telescope. Results. By comparing the color trend of the illumination generated by SCALA during two commissioning runs, and to previous laboratory measurements, we show that we can determine the light emitted by SCALA with a long-term repeatability better than 1%. We describe the calibration procedure necessary to control for system aging. We present measurements of the SNIFS throughput as estimated by SCALA observations. Conclusions. The SCALA calibration unit is now fully deployed at the UH 88 telescope, and with it color-calibration between 4000 Å and 9000 Å is stable at the percent level over a one-year baseline.},
doi = {10.1051/0004-6361/201731076},
journal = {Astronomy and Astrophysics},
number = ,
volume = 607,
place = {United States},
year = {2017},
month = {11}
}

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